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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 989

Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.

A.to cover B.to be covered
C.to have covered D.to have been covered
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Loulanisbelievedoverbysandstor